Parks only or do national lakeshores and military parks count?
We've been to:
Mammoth Cave National Park
Smoky Mountains National Park
Cuyahoga Valley National Park
Pictured Rocks National Lakeshore
Sleeping Bear Dunes National Lakeshore
Point Park National Military Park
Chickamauga National Military Park
Favorites were Mammoth Cave, Smoky Mountains and Cuyahoga Valley. Least favorites were Sleeping Bear Dunes and Chickamauga.
Future wish list includes: Yellowstone, Everglades, Acadia, Mesa Verde, Grand Canyon, Arches and Bryce Canyon.